ZDI publishes ZDI-26-642 for CVE-2026-60159, an out-of-bounds read local privilege escalation in Oracle VirtualBox IDisplay, rated CVSS 7.5.
Zero Day Initiative published advisory ZDI-26-642 describing an out-of-bounds read in Oracle VirtualBox's IDisplay component that enables local privilege escalation. Attackers must first obtain the ability to execute high-privileged code on the target guest system. ZDI rated the issue CVSS 7.5 and assigned CVE-2026-60159.
ZDI disclosed CVE-2026-19820, a CVSS 6.1 local link-following denial-of-service flaw in the bzbackup component of Backblaze Personal Computer Backup.
The Zero Day Initiative published advisory ZDI-26-624 for a denial-of-service vulnerability in Backblaze Personal Computer Backup's bzbackup component. A local attacker must first gain the ability to run low-privileged code on the target system to trigger the link-following flaw. ZDI rated the issue CVSS 6.1 and assigned CVE-2026-19820.
Microsoft's September Patch Tuesday fixed a record 974 flaws, including two Windows privilege-escalation zero-days actively exploited and added to CISA's KEV catalog.
Microsoft's September 2026 Patch Tuesday addressed a record 974 vulnerabilities (999 including 25 non-Microsoft CVEs), with over 110 rated critical; 723 affect Windows and 111 affect Office. Two Windows privilege-escalation zero-days are actively exploited: CVE-2026-85880, an ALPC heap-based buffer overflow, and CVE-2026-81963, an improper link resolution flaw in the Windows Update Stack, both allowing attackers to gain SYSTEM privileges. CISA added both flaws to its KEV catalog, giving federal civilian agencies until September 22, 2026 to apply fixes. Volexity, Proofpoint, MSTIC, and independent researchers were credited with the reports; notable additional fixes include network-reachable RCEs in Exchange, SharePoint, SQL Server, Remote Desktop Services, DNS, and DHCP.
Microsoft's September 2026 Patch Tuesday ships 964 fixes including two exploited Windows zero-days (CVE-2026-85880, CVE-2026-81963) and a wormable DNS RCE.
Microsoft's September 2026 Patch Tuesday includes 964 Microsoft vulnerabilities requiring customer action, a record attributed to AI-assisted bug discovery, plus 174 third-party/open-source and 23 Chromium/Edge CVEs. Two zero-days are exploited in the wild: CVE-2026-85880, a Windows ALPC heap overflow enabling AppContainer sandbox escape and privilege escalation, and CVE-2026-81963, a Windows Update Stack escalation to SYSTEM. CVE-2026-69730, an unauthenticated Windows DNS RCE, is not yet exploited but Microsoft expects exploitation, and roughly 20 bugs could be wormable. Separately, SAP issued a critical CVSS 10.0 fix for the EPP component used in S/4HANA and NetWeaver.
Microsoft patches 974 flaws in record Patch Tuesday, including two actively exploited Windows zero-days enabling privilege escalation.
Microsoft's largest-ever Patch Tuesday addresses 974 vulnerabilities, with CVE-2026-81963 (Windows Update Stack) and CVE-2026-85880 (Windows Advanced Local Procedure Call) exploited before disclosure. Both zero-days carry CVSS 7.8 ratings and allow privilege escalation. More than 10% of the defects are rated critical, and researchers attribute the record volume to AI-assisted vulnerability discovery without a matching rise in active exploitation.
Microsoft's September Patch Tuesday fixes a record 972 vulnerabilities, 112 rated critical, including two zero-days in Windows components.
Microsoft's September 2026 release patched roughly 972 vulnerabilities (997 including ported Chromium fixes for Edge), a record, with 112 rated critical. Notable flaws include two zero-days: CVE-2026-81963 in the Windows update service and CVE-2026-85880 in the Windows Advanced Local Procedure, with no public information on exploitation breadth. Microsoft has fixed 2,760 vulnerabilities in 2026, more than double last year's total, which ZDI's Dustin Childs attributes to AI-assisted discovery becoming the 'new normal'.
Microsoft's September 2026 Patch Tuesday fixes a record 974 CVEs, including two Windows zero-days exploited in the wild for privilege escalation.
Microsoft patched 974 vulnerabilities, its largest Patch Tuesday ever, including CVE-2026-85880, a heap buffer overflow in Windows ALPC allowing AppContainer sandbox escape to System, and CVE-2026-81963, a link-following flaw in the Windows Update Stack enabling local privilege escalation. Both were exploited as zero-days before the patch. ZDI's Dustin Childs says 20 of the fixed flaws are wormable, enabling unauthenticated remote code execution. The release also covers 723 Windows flaws and 222 Office bugs, plus fixes in Exchange, SharePoint, SQL Server, Azure and Exchange Server RCE (CVE-2026-55007).
ZDI disclosed CVE-2026-62712, a CVSS 7.8 improper object management flaw in Windows UMPDDrvRealizeBrush enabling local privilege escalation after low-privileged code execution.
The Zero Day Initiative published ZDI-26-621 covering a local privilege escalation vulnerability in Microsoft Windows' UMPDDrvRealizeBrush component, caused by improper object management. An attacker must already be able to execute low-privileged code on the target system before exploiting the flaw. ZDI assigned the vulnerability a CVSS score of 7.8 and the CVE identifier CVE-2026-62712.
ZDI disclosed CVE-2026-50696, a CVSS 8.1 integer underflow in Windows IKEv2 AES-GCM decryption enabling unauthenticated remote code execution on specific IPsec configurations.
The Zero Day Initiative published ZDI-26-622 describing a remote code execution vulnerability in Microsoft Windows' IKEv2 AES-GCM decryption path, caused by an integer underflow. Authentication is not required for exploitation, but only systems using specific IPsec configurations are affected. ZDI assigned the vulnerability a CVSS score of 8.1 and the identifier CVE-2026-50696.
ZDI disclosed CVE-2026-62712, a CVSS 7.8 improper object management flaw in Windows UMPDDrvStretchBltROP enabling local privilege escalation from low-privileged code.
The Zero Day Initiative published ZDI-26-619 covering a local privilege escalation vulnerability in Microsoft Windows' UMPDDrvStretchBltROP function, stemming from improper object management. Exploitation requires that the attacker first obtain the ability to run low-privileged code on the target system. ZDI rated the issue CVSS 7.8 and assigned CVE-2026-62712, the same identifier listed in the companion UMPDDrvRealizeBrush advisory.
ZDI details CVE-2026-33824, a double-free in Windows IKEv2 fragment reassembly enabling unauthenticated remote code execution as SYSTEM on Windows.
Zero Day Initiative published technical analysis of CVE-2026-33824, a double-free in the Windows IKE Extension (ikeext.dll) caused by improper ownership handling of a heap blob pointer during IKEv2 fragment reassembly in IkeReinjectReassembledPacket(). A remote unauthenticated attacker can send a crafted IKE_SA_INIT message with a Security Realm Vendor ID followed by fragmented IKE_AUTH payloads to trigger the double free. Successful exploitation could yield arbitrary code execution under the IKEEXT service context (SYSTEM). ZDI also provided IDS detection guidance correlating the two-packet sequence on UDP ports 500 and 4500.
Critical CVSS 9.8 RCE CVE-2026-0768 in Langflow is under active exploitation, with attackers probing for credentials and secrets.
CVE-2026-0768, a critical (CVSS 9.8) remote code execution flaw in Langflow's code validator, lets attackers execute Python code with root privileges via the validate endpoint's code parameter. VulnCheck honeypots in the UK detected Russian-origin exploitation performing reconnaissance and credential harvesting, querying environment variables like LANGFLOW_SUPERUSER and AWS keys and reading Langflow's secret key. Versions before 1.4.2 are affected; no vendor advisory or public PoC was available at reporting time.
Zero Day Initiative disclosed an uncontrolled search path flaw in pdfforge PDF Architect's update service, allowing local privilege escalation (CVSS 7.8).
ZDI published advisory ZDI-26-615 describing a local privilege escalation vulnerability in the activation-service Update Service of pdfforge PDF Architect. An uncontrolled search path element lets local attackers escalate privileges, but they must first be able to execute low-privileged code on the target. ZDI rated the issue 7.8 and tagged it as a 0-day disclosure.
ZDI published ZDI-26-612, an unpatched out-of-bounds write in pdfforge PDF Architect PDF parsing enabling remote code execution (CVSS 7.8).
The Zero Day Initiative disclosed ZDI-26-612, an out-of-bounds write vulnerability in pdfforge PDF Architect's PDF file parsing. Successful exploitation allows remote code execution on affected installations. User interaction is required, as the target must visit a malicious page or open a malicious file; ZDI assigned a CVSS score of 7.8 and lists the flaw as a 0day.
ZDI published ZDI-26-614, another unpatched out-of-bounds write in pdfforge PDF Architect PDF parsing enabling remote code execution (CVSS 7.8).
The Zero Day Initiative published ZDI-26-614, a second out-of-bounds write vulnerability in pdfforge PDF Architect's PDF file parsing. Attackers can execute arbitrary code on affected installations, provided the user visits a malicious page or opens a malicious file. The flaw carries a ZDI-assigned CVSS score of 7.8 and remains unpatched (0day).
ZDI published ZDI-26-613, an unpatched memory corruption flaw in pdfforge PDF Architect PDF parsing enabling remote code execution (CVSS 7.8).
The Zero Day Initiative disclosed ZDI-26-613, a memory corruption vulnerability in pdfforge PDF Architect's PDF file parsing that allows remote code execution on affected installations. User interaction is required, meaning the target must visit a malicious page or open a malicious file. ZDI assigned a CVSS score of 7.8 and classifies the issue as a 0day.
ZDI published ZDI-26-611, an unpatched out-of-bounds read in pdfforge PDF Architect App Object enabling remote code execution (CVSS 7.8).
The Zero Day Initiative disclosed ZDI-26-611, an out-of-bounds read vulnerability in the App Object component of pdfforge PDF Architect that can lead to remote code execution. Exploitation requires user interaction, such as visiting a malicious page or opening a malicious file. ZDI rated the issue 7.8 on the CVSS scale and marks it as a 0day pending a vendor patch.
NVIDIA TensorRT improper array index validation in ONNX parsing (CVE-2026-24238, CVSS 7.8) enables remote code execution.
ZDI-26-592 addresses improper validation of array index in NVIDIA TensorRT's ONNX file parsing, tracked as CVE-2026-24238 with CVSS 7.8. Exploitation permits remote code execution on affected installations and requires user interaction. The advisory was published by the Zero Day Initiative on August 24, 2026.
Foxit PDF Reader has a second annotation use-after-free vulnerability (CVE-2026-13127, CVSS 7.8) allowing remote code execution via malicious files or pages.
ZDI-26-603 describes a use-after-free vulnerability in the annotation feature of Foxit PDF Reader, tracked as CVE-2026-13127 with a CVSS score of 7.8. Successful exploitation allows remote attackers to execute arbitrary code, but requires user interaction such as visiting a malicious page or opening a malicious file. The advisory does not mention any exploitation in the wild.
The Linux kernel KVM IOAPIC has a use-after-free (CVSS 8.2) allowing local privilege escalation, but exploitation requires high-privileged code execution first.
ZDI-26-608 describes a use-after-free vulnerability in the Linux kernel's KVM IOAPIC component, with a CVSS score of 8.2. An attacker must first obtain the ability to execute high-privileged code on the target system, which limits the practical impact of the privilege escalation. The advisory text does not list an assigned CVE identifier.
ZDI advisory ZDI-26-586 reports a memory corruption RCE (CVE-2026-19886, CVSS 7.8) in OriginLab Origin Viewer OGM file parsing, needing user interaction.
The Zero Day Initiative published advisory ZDI-26-586 describing a memory corruption vulnerability in OriginLab Origin Viewer's OGM file parsing. Exploitation allows remote code execution when a user opens a malicious file or visits a crafted page. ZDI rated the issue CVSS 7.8 and assigned CVE-2026-19886.
Foxit PDF Reader has a use-after-free vulnerability (CVE-2026-57252, CVSS 7.8) allowing remote code execution via malicious AcroForm content.
ZDI-26-597 describes a use-after-free vulnerability in the AcroForm feature of Foxit PDF Reader, tracked as CVE-2026-57252 with a CVSS score of 7.8. Successful exploitation allows remote attackers to execute arbitrary code, but requires user interaction such as visiting a malicious page or opening a malicious file. The advisory does not mention any exploitation in the wild.
Foxit PDF Reader has a use-after-free vulnerability (CVE-2026-13129, CVSS 3.3) allowing sensitive information disclosure when a user opens malicious content.
ZDI-26-601 describes a use-after-free vulnerability in the annotation feature of Foxit PDF Reader, tracked as CVE-2026-13129 with a CVSS score of 3.3. Successful exploitation allows remote attackers to disclose sensitive information, but requires user interaction such as visiting a malicious page or opening a malicious file. The advisory does not mention any exploitation in the wild.
Foxit PDF Reader annotation use-after-free (CVE-2026-57237, CVSS 3.3) can disclose sensitive information when users open malicious PDFs.
ZDI-26-600 documents a use-after-free in Foxit PDF Reader annotation handling that allows remote information disclosure, tracked as CVE-2026-57237 with CVSS 3.3. Exploitation requires user interaction such as opening a malicious file or visiting a malicious page. The advisory was published by the Zero Day Initiative on August 24, 2026.
ZDI disclosed CVE-2026-19773, an unauthenticated out-of-bounds write allowing remote code execution in libwebsockets HTTP/2 HPACK parsing, rated CVSS 9.8.
The Zero Day Initiative published advisory ZDI-26-590 for an out-of-bounds write vulnerability in libwebsockets' HTTP/2 HPACK path header parsing. A remote attacker can execute arbitrary code on affected installations without authentication. The flaw is tracked as CVE-2026-19773 and carries a CVSS score of 9.8.
The Linux kernel net scheduler packet classifier has a use-after-free (CVSS 7.8) allowing local attackers to escalate privileges from low-privileged code.
ZDI-26-609 describes a use-after-free vulnerability in the Linux kernel's network scheduler packet classifier, with a CVSS score of 7.8. An attacker must first be able to execute low-privileged code on the target system before escalating privileges. The advisory text does not list an assigned CVE identifier.
Foxit PDF Reader use-after-free flaw (CVE-2026-13126) allows remote code execution when users open malicious files; CVSS 7.8 per ZDI advisory.
ZDI-26-604 describes a use-after-free vulnerability in Foxit PDF Reader's annotation handling, tracked as CVE-2026-13126 and rated CVSS 7.8. Exploitation requires user interaction, with the target visiting a malicious page or opening a malicious file, and allows remote attackers to execute arbitrary code. The advisory was published by the Zero Day Initiative on August 24, 2026.
ZDI published advisory ZDI-26-599 for a use-after-free information disclosure flaw (CVE-2026-57238, CVSS 3.3) in Foxit PDF Reader requiring user interaction.
The Zero Day Initiative released advisory ZDI-26-599 describing a use-after-free vulnerability in Foxit PDF Reader's annotation handling. The flaw allows remote attackers to disclose sensitive information when a target opens a malicious file or visits a malicious page. ZDI rated the issue CVSS 3.3 and assigned CVE-2026-57238.
ZDI disclosed a second TensorRT heap-based buffer overflow RCE (CVE-2026-24268, CVSS 7.8) in ONNX file parsing, requiring user interaction.
The Zero Day Initiative published advisory ZDI-26-593 covering another heap-based buffer overflow in NVIDIA TensorRT's ONNX file parsing. A remote attacker can execute arbitrary code if the target opens a malicious file or visits a crafted page. ZDI rated the vulnerability CVSS 7.8 and assigned CVE-2026-24268.
ZDI advisory ZDI-26-587 details a heap-based buffer overflow RCE (CVE-2026-19781, CVSS 7.8) in Ashlar-Vellum Cobalt VS file parsing, requiring user interaction.
The Zero Day Initiative released advisory ZDI-26-587 covering a heap-based buffer overflow in Ashlar-Vellum Cobalt's VS file parsing. A remote attacker can execute arbitrary code when the target opens a malicious file or visits a crafted page. ZDI rated the vulnerability CVSS 7.8 and assigned CVE-2026-19781.
ZDI disclosed a heap-based buffer overflow RCE (CVE-2026-24272, CVSS 7.8) in NVIDIA TensorRT ONNX parsing, requiring user interaction to exploit.
The Zero Day Initiative published advisory ZDI-26-591 covering a heap-based buffer overflow in NVIDIA TensorRT's ONNX file parsing. Successful exploitation allows remote code execution when a user opens a malicious ONNX file or visits a crafted page. ZDI rated the vulnerability CVSS 7.8 and assigned CVE-2026-24272.
ZDI advisory ZDI-26-605 details an improper input validation flaw (CVE-2026-50508, CVSS 3.3) in Microsoft Windows localized filenames that leaks NTLM responses.
The Zero Day Initiative released advisory ZDI-26-605 describing improper input validation in Microsoft Windows handling of localized filenames. Remote attackers can disclose NTLM authentication responses if the target opens a malicious file or visits a crafted page. ZDI rated the issue CVSS 3.3 and assigned CVE-2026-50508. Leaked NTLM responses could enable offline credential cracking.
Foxit PDF Reader AcroForm use-after-free (CVE-2026-57242, CVSS 7.8) permits remote code execution through malicious PDF files or pages.
ZDI-26-598 details a use-after-free in the AcroForm component of Foxit PDF Reader, tracked as CVE-2026-57242 and rated CVSS 7.8. A remote attacker can execute arbitrary code if the target opens a malicious file or visits a malicious page. The advisory was published by the Zero Day Initiative on August 24, 2026.
ZDI details a network-adjacent stack buffer overflow in BlueZ's A2DP stack (CVE-2026-19774, CVSS 7.1) allowing remote code execution after pairing a malicious Bluetooth device.
The Zero Day Initiative published advisory ZDI-26-589 for a stack-based buffer overflow in BlueZ, the Linux Bluetooth protocol stack. A network-adjacent attacker who can pair a malicious Bluetooth device with the target can execute arbitrary code on the affected installation. The flaw carries a CVSS 7.1 rating and is tracked as CVE-2026-19774.
Foxit PDF Reader has a use-after-free vulnerability (CVE-2026-57254, CVSS 7.8) allowing remote code execution when a user opens a malicious file or page.
ZDI-26-595 describes a use-after-free vulnerability in the annotation feature of Foxit PDF Reader, tracked as CVE-2026-57254 with a CVSS score of 7.8. Successful exploitation allows remote attackers to execute arbitrary code, but requires user interaction such as visiting a malicious page or opening a malicious file. The advisory does not mention any exploitation in the wild.
Foxit PDF Reader out-of-bounds read in PDF parsing (CVE-2026-57253, CVSS 3.3) can leak sensitive information via malicious files.
ZDI-26-596 covers an out-of-bounds read in Foxit PDF Reader's PDF file parsing, tracked as CVE-2026-57253 and rated CVSS 3.3. Successful exploitation allows remote attackers to disclose sensitive information and requires the target to open a malicious file or page. The advisory was published by the Zero Day Initiative on August 24, 2026.
ZDI-26-594 describes a code injection vulnerability in NVIDIA Megatron Bridge's load_model_config function, tracked as CVE-2026-24251 with CVSS 7.8. Exploitation allows remote attackers to execute arbitrary code on affected installations and requires user interaction. The advisory was published by the Zero Day Initiative on August 24, 2026.
A fake PoC for WinRAR RCE CVE-2023-40477 posted on GitHub actually deploys VenomRAT through a multi-step infection chain targeting researchers.
Four days after Zero Day Initiative publicly disclosed the WinRAR RCE vulnerability CVE-2023-40477 on August 17, 2023, an actor using the alias whalersplonk published a fake proof-of-concept on GitHub. The Python script actually repurposed public PoC code for GeoServer SQL injection CVE-2023-25157 and triggered an infection chain ending in VenomRAT. The README and an accompanying video lured users into running the script; the video drew over 100 plays. Unit 42 assesses the actor was opportunistic, targeting other miscreants adopting new vulnerabilities rather than researchers specifically.
ZDI discloses an unauthenticated, network-adjacent RCE in PAX Technology Q80 payment terminals via installer signature bypass, rated CVSS 7.5.
ZDI-26-526 describes a signature verification bypass in the PAX Technology Q80 application installer that lets network-adjacent attackers execute arbitrary code without authentication. The 0-day is tracked as CVE-2026-19910 and CVE-2026-19911 and carries a CVSS score of 7.5. No public patch was noted at the time of disclosure.
Zero Day Initiative discloses CVE-2026-20215, an integer overflow in ClamAV's 7z archive parsing enabling remote code execution, rated CVSS 8.4.
The Zero Day Initiative published ZDI-26-583 for an integer overflow in Clam AntiVirus's 7z archive parsing. A remote attacker can execute arbitrary code when the antivirus processes a crafted archive, with attack vectors varying by implementation. The flaw is tracked as CVE-2026-20215 and rated CVSS 8.4. The advisory does not mention active exploitation.
Heap-Based Buffer Overflow in Windows ALPC Enables Local Privilege Escalation
CVE-2026-85880 is a heap-based buffer overflow in Windows Advanced Local Procedure Call (ALPC), the Windows mechanism for local inter-process communication. An authorized local attacker can trigger the overflow by submitting crafted input over ALPC, corrupting heap memory in the component that handles the request. Successful exploitation allows the attacker to execute code with elevated privileges, typically gaining SYSTEM-level control of the local host, which is especially valuable as a post-exploitation or sandbox-escape step. Affected products include Windows 10 (1607, 1809, 21H2, 22H2) and Windows Server 2012, 2016, 2019, and 2022, meaning most on-premises Windows estates are in scope. The flaw was fixed in Microsoft's record 974-CVE September 2026 Patch Tuesday and was added to CISA's KEV on 2026-09-08, confirming exploitation in the wild; press reports describe Windows zero-days being chained with a Chrome zero-day in 'BlueMoon' kit attacks, though the data does not explicitly confirm this CVE is the Windows flaw in that chain.
· Microsoft Windows 10 1607, 1809, 21H2, 22H2 · Microsoft Windows Server 2012, 2016, 2019, 2022 KEVmass
Local Privilege Escalation via Link Following in Windows Update Stack
CVE-2026-81963 is a link-following flaw (CWE-59, improper link resolution before file access) in the Microsoft Windows Update Stack, in which the component fails to correctly resolve file links before opening them. A local attacker with low privileges can plant or manipulate a link (symlink/junction) that the privileged update stack follows during operation, redirecting its file access to an attacker-controlled target. The result is local privilege escalation — CVSS 3.1 rates this 7.8 (high) with high confidentiality, integrity, and availability impact — allowing an authorized local user or malware already on the machine to gain elevated rights. Affected products are Windows 11 23H2, 24H2, 25H2, and 26H1 and Windows Server 2025; any unpatched system on those versions is exposed to any local account holder. The flaw was fixed in Microsoft's record September 2026 Patch Tuesday (974 CVEs), was added to CISA's KEV on 2026-09-08 as one of two Windows zero-days reported as exploited in the wild, and has no known public PoC or confirmed ransomware use.
· Microsoft Windows 11 23H2, 24H2, 25H2, 26H1 · Microsoft Windows Server 2025 KEVmass
CVE-2026-69730 is a use-after-free memory corruption flaw (CWE-416) in the Windows DNS service that allows an unauthenticated, remote attacker to execute arbitrary code by sending crafted network traffic to the affected system. Because the flaw is network-exploitable with no privileges or user interaction required (CVSS 3.1 9.8), any system running the vulnerable DNS service is a direct target. Successful exploitation would give the attacker code execution in the context of the DNS service, which on Windows Server typically runs with high privileges such as SYSTEM, and could enable wormable spread between vulnerable hosts. Affected organizations are those running the Windows DNS Server role — a component deployed on virtually all Windows Server domain controllers and on dedicated Windows DNS servers, especially those exposed to untrusted networks. As of the September 2026 Patch Tuesday release, there is no known public proof-of-concept, the flaw is not listed in CISA's KEV, and it has not been confirmed exploited in the wild, though it was flagged among roughly 20 'wormable' bugs and described in press coverage as a successor to the 2020 SigRed Windows DNS RCE.
· Microsoft Windows DNS Server role (Windows Server)mass
Double Free Enables Unauthenticated RCE in Microsoft Exchange Server
CVE-2026-55007 is a double-free memory corruption flaw (CWE-415) in Microsoft Exchange Server in which the same heap allocation is freed twice, corrupting memory. A remote, unauthenticated attacker can trigger the flaw over the network, though the high attack complexity (AC:H) means reliable exploitation likely depends on favorable heap/timing conditions, making it harder to weaponize than typical pre-auth RCEs. Successful exploitation yields arbitrary code execution with high impact on confidentiality, integrity, and availability (CVSS 3.1: 8.1). Any organization running on-premises Microsoft Exchange Server is in scope, with the greatest risk on servers reachable from untrusted networks. As of now there is no public proof-of-concept, the flaw is not in CISA's KEV catalog, and EPSS estimates only a 0.7% chance of exploitation within 30 days; it was disclosed amid Microsoft's record September 2026 Patch Tuesday (974 CVEs), which press coverage highlighted for notable Exchange flaws.
Use-After-Free RCE in Windows Remote Desktop Services
CVE-2026-69525 is a use-after-free memory corruption flaw (CWE-416) in Windows Remote Desktop Services, rated critical at CVSS 9.8. Per the CVSS vector, a remote, unauthenticated attacker can reach the vulnerable code path over the network with no privileges and no user interaction, presumably by sending crafted input to the RDP/RDS service. Successful exploitation yields remote code execution with high impact on confidentiality, integrity, and availability. Any Windows system running Remote Desktop Services is affected, and organizations exposing RDP (TCP 3389) to the internet are the primary concern, since public scans show millions of such endpoints. There is no public proof-of-concept or CISA KEV listing yet, and EPSS estimates a ~1.1% (63rd percentile) chance of exploitation within 30 days; the fix shipped as part of Microsoft's record 974-CVE Patch Tuesday, which separately included two exploited Windows zero-days and 20 wormable bugs.
Unbootable-System Denial of Service via Link Following in Backblaze Windows Backup Client
CVE-2026-19820 is a link-following flaw (CWE-59) in the Backblaze Personal Computer Backup client for Windows, whose backup components (bzserv, bztransmit, bzfilelist, bzbackup, and bzreports) do not properly resolve links in the folders they traverse. A local user can create a link from Backblaze's folder to Windows OS system files during a backup; when the client follows the link, the affected machine can be rendered unbootable. Successful exploitation requires that an administrator-level system change has removed the specific Windows OS security controls that normally govern link resolution, allowing the link to be planted in this way. The impact is loss of availability of the whole system (high impact on the system's ability to boot), not data theft. Exploitation is not currently known: no public PoC exists, the flaw is not in CISA's KEV catalog, and EPSS puts 30-day exploitation probability at about 0.3%.
· Backblaze Personal Computer Backup (Backblaze Client) for Windows, including the bzserv, bztransmit, bzfilelist, bzbackup, and bzrlarge
Use-After-Free Privilege Escalation in Microsoft Windows ALPC
CVE-2023-21674 is a use-after-free flaw (CWE-416) in the Windows Advanced Local Procedure Call (ALPC) facility, the kernel-level mechanism Windows uses for fast communication between processes and system services. An attacker who can already run code on a Windows machine can trigger the bug by sending crafted ALPC requests, corrupting memory in a privileged process. Successful exploitation allows a local, low-privileged attacker to elevate to SYSTEM/administrator privileges, typically to gain full control of the host or to complete an exploit chain after an initial compromise. Essentially all supported Windows client and server installations from Microsoft are affected; the source data does not list specific versions, and the fix shipped with Microsoft's January 2023 Patch Tuesday, which addressed a record 974 vulnerabilities including this and one other actively exploited Windows zero-day. CISA added the CVE to the Known Exploited Vulnerabilities catalog on 2023-01-10, confirming exploitation in the wild; no public proof-of-concept is known, ransomware use is undetermined, and EPSS estimates a 41.8% probability of exploitation in the next 30 days (99th percentile).
Injection Flaw in Microsoft SQL Server Enables Network Privilege Escalation
Microsoft SQL Server contains an injection vulnerability (CWE-74) in which special elements in output used by a downstream component are not properly neutralized. An unauthorized attacker can trigger the flaw remotely over a network, though the CVSS vector indicates that some form of user interaction is required in the attack path. Successful exploitation allows elevation of privileges with high impact on confidentiality, integrity, and availability, and the changed-scope metric suggests the attack crosses a security boundary into another component. Any organization running affected Microsoft SQL Server versions is potentially exposed, although the data provided does not specify exact affected version ranges. No public proof of concept, CISA KEV listing, or known exploitation exists; EPSS estimates only a 0.7% probability of exploitation in the next 30 days, and the fix shipped with Microsoft's record-setting September 2026 Patch Tuesday release (974 flaws patched).
Improper Authentication in Microsoft Authenticator Enables Local Privilege Escalation
CVE-2026-80097 is an improper authentication flaw (CWE-287) in Microsoft Authenticator that allows an unauthorized attacker to elevate privileges locally, rated 8.6 (high) with no privileges required, required user interaction, and a changed scope. Exploitation requires local access to a device running the app plus user interaction, and because the scope is changed, a successful attack crosses a security boundary beyond the Authenticator component itself. A successful exploit yields local privilege elevation with high impact to confidentiality, integrity, and availability. Anyone running affected versions of Microsoft Authenticator is affected; the app is Microsoft's standard multi-factor authentication app for Entra ID/Microsoft 365 and is widely deployed across enterprise and personal mobile devices. As of the September 2026 disclosure it is not known to be exploited - no public PoC, not in CISA KEV, EPSS 0.4% (33rd percentile) - and it was patched amid the record 974-flaw Patch Tuesday, though the two actively exploited zero-days in that release are Windows flaws, not this one.
Heap Buffer Overflow in Windows Win32K Enables Local Privilege Escalation
CVE-2026-62712 is a heap-based buffer overflow (CWE-122) in the Windows Win32K kernel component, with Microsoft's related advisories (ZDI-26-542/618/619/620/621) tying the flaw to user-mode printer driver (UMPD) graphics callbacks such as UMPDDrvBitBlt, UMPDDrvStretchBlt and UMPDDrvRealizeBrush. A local attacker with valid low-privileged credentials can trigger the overflow through crafted GDI/printer-driver operations, with no user interaction required. Successful exploitation elevates the attacker from a standard user to kernel/SYSTEM level, yielding high confidentiality, integrity and availability impact on the host. Every Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (23H2 through 26H1) and Windows Server (2012, 2016, 2019, 2022) installation on the listed builds is affected, which spans most of the supported Windows fleet. There is no public proof-of-concept, no CISA KEV listing, and a low EPSS of 0.4%, indicating no confirmed exploitation to date.
· Microsoft Windows 10 1607, 1809, 21H2, 22H2 · Microsoft Windows 11 23H2, 24H2, 25H2, 26H1mass
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